Patent10.1121/1.406904
Method for protecting multi-pulse coders from fading and random pattern bit errors
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TL;DR: In this paper, a low-overhead method of protecting multi-pulse speech coders from the effects of severe random or fading pattern bit errors combines a standard error correcting code (convolutional rate 1/2 coding and Viterbi trellis decoding) for protection in random errors with cyclic redundancy code (CRC) error detection for fading errors.
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Abstract: A low-overhead method of protecting multi-pulse speech coders from the effects of severe random or fading pattern bit errors combines a standard error correcting code (convolutional rate 1/2 coding and Viterbi trellis decoding) for protection in random errors with cyclic redundancy code (CRC) error detection for fading errors. Compensation for detected fading errors takes place within the speech coder. Protection is applied only to the perceptually significant bits in the transmitted frame.
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Citations
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117
Enhancement of speech coding in background noise for low-rate speech coder
TL;DR: In this paper, a speech coding system employs measurements of robust features of speech frames whose distribution is not strongly affected by noise/levels to make voicing decisions for input speech occurring in a noisy environment.
103
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Intelligent locator system with multiple bits represented in each pulse
Alexander Conrad,Charles Bell +1 more
- 07 Oct 1992
TL;DR: In this paper, a locating and monitoring system includes transmitters worn by a person, animal, or equipment to transmit an unique identification code while moving about a facility, which is transmitted by pulse bursts at diverse times during predetermined time intervals to prevent synchronization with resident signals in the facility.
90
Voice encoding method and voice decoding method
TL;DR: A compressed digital speech signal is encoded to provide a transmission error-resistant transmission signal to support voiced/unvoiced sound discrimination and CRC codes are presented.
80
References
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Degan Neviano Dal,Fulvio Rusina +1 more
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TL;DR: In this article, a radio transceiving system of low bit-rate coded speech signals, to be installed on mobiles, allows the detection and correction of burst errors present in the demodulated coded signal, in the receiver.
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TL;DR: In this article, a data transmission system for providing error protection of transmitted data words is presented, where the less significant bits of a data word are encoded into a first redundant proto-code word and the more significant bits are, by means of further matrix multiplication and delay by different word recurrence intervals encoded in a set of further redundant code words.
27
Speech-adaptive predictive coding system having reflected binary encoder/decoder
TL;DR: In this paper, a speech predictive coding system produces a predicted residual sequence and parameter information representing predictor coefficients and residual power representing burst errors in the multiplexed signal are detected at the receiver using a burst-energy detector.
24
•Proceedings Article
Communications by vocoder on a mobile satellite fading channel
N. dal Degan,F. Perosino,F. Rusina +2 more
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9
A new model of LPC excitation for producing natural-sounding speech at low bit rates
TL;DR: This paper describes a new approach to the excitation problem that does not require a priori knowledge of either the voiced-unvoiced decision or the pitch period, and minimizes a perceptual-distance metric representing subjectively-important differences between the waveforms of the original and the synthetic speech signals.